Mandrel



E B. NEWELL n 2,146,590.

Feb. 7, 1939.

MANDREL Filed'sept. le, v1958 Patented Feb. 7, 1939 y Y i 'UNITED `STATES PATENT OFFICE MANDREL Earl B. Newell, St. Paul, Minn. Application September 16, 1938,v Serial No. 230,256 2 Claims. (Ol. 242-72) This invention relates to a collapsible and exeach mandrel section 4--5, diametrically of each pansible mandrel useful for a number of purposes other, each said pair of segments having inwardly but particularly adaptable for use inthe cores of tapered faces. IIIA in Fig. l designates an interpaper rolls such as used in the newspaper inmediate set of arched segments of which there 5; dustry. may be two or more sets, each engaged by a cone An object of the invention is to provide an im- 8 rotatably engaged centrally by the adjustment proved and simplied yet highly efficient mandrel shaft 9 in the same manner as cone SR. A preof the class described. ferred method of rotary engagement of shaft 9 in This mandrel is tubular and preferably made cones 8 and BR is the provision of a pair of collars l() of two longitudinally registering sections and a II which are properly spaced and retained on the 10 central shaft to simultaneously manipulate a plushaft as with a cotter key I2. rality of expansion members, two of said mem- IBR and I3L designate, for example only, a pair bers located at the respective ends and bored to of spindles as of a printing press and rotatably provide bearing means engaging the roller spinengaging respectively the bores of the cones 8B.

l5 dles of a printing press. Extreme simplicity and and 8L. I6 designates in dotted outline a roll 15 eicient action are stressed, reference being had of news print paper in the core or central bore of to the accompanying drawing; in whichwhich my device is inserted while contracted.

Fig. 1 is a longitudinal, diametrical section illus- I4 are a number of transverse webs in the man-l trating a mandrel constructed in accordance with drel each comprising two registering parts one 2o a preferred embodiment of my invention. part xed in each mandrel section. The central 20 Fig. 2 is a left end elevation of Fig. 1. part of each web has a bore I4B for allowing pas- Fig. 3 is an enlarged sectional view taken subsage of the shaft 9 freely therethrough. The said stantially on the line 3-3 of Fig. 1. webs are provided with two pairs of horizontally Referring to the drawing by referencenumerdisposed lugs I4L, a pair at each side of the bore g5 als, like characters designating corresponding and spaced apart vertically (see Fig. 3). 25 parts in the various views;l in the preferred em- In each such pair of lugs, one lug is threaded bodiment of the mandrel it is tubular comprising and the other has a registering bore for insertion two registering, opposite semi-tubular sections of a machine bolt I5 through the latter and into designated 4 and 5, normally with edges contactthe threaded lug. When positioned, such bolts so ing when the mandrel is adjusted to minimum each has its head in spaced relation to the adjasize. 6 is a two part flange iixed at one end of cent lug as shown thus limiting the amount of the mandrel one part on each mandrel section, spreading or expansion of the mandrel, yet holdsaid ange parts keyed together slidably, as with ing the mandrel sections together at all times. a pair of dowel pins 1 which serve to hold the end These lugmembers need only be on the web parts in proper relation when the mandrel is members I4 nearest the ends of the mandrel and 35 expanded. are accessible for adjustment (by the bolts I5) At and Within each of the end parts of the manwhen the cones and shaft are not in place. drel is centrally and reciprocally retained a com- In contracted or what may also be termed colbination cone and bearing member tapering inlapsed condition the mandrel is of minimum size,

wardly, the right hand cone designated 8B. and the vedges of the main sections being in contact 40 the left hand one 8L, the latter at the flanged and the cones 8 and SR are separated from cone end of the mandrel. Both these cones have out- 8L to about the limit permitted by the threads wardly open bores 8B their inner ends being 9T. In this condition the mandrel is slidably closed. The said end cones are connected ceninserted in the central bore of a paper roll I6 trally and manipulated by a central bar 9 rotatuntil flange 6 contacts one end thereof. Then 45 ably retained in the inner closed end of the cone inserting an end-socket wrench in the bore of cone 8R but the inner end of cone 8L is threaded to 8L and engaging the end of the rod 9 the latter receive the correspondingly threaded part 9T of is rotated simultaneously drawing the cones 8 and the bar or shaft 9 which projects into the bore 8B SR toward cone 8L and all the cones simultaof said cone 8L and its end is of polygonal form neously engaging the segments I0 and expanding 50 as at SP.. 'I'his end part SP is of course easily the mandrel uniformly throughout its entire accessible for engagement by a socket Wrench length. The amount of expansion required is (not Shown) usually not great, for the use described, the paper Each cone (SR-8L) is in contact exteriorly roll is securely engaged and the roll is ready for with a pair of arched segments I0, one fixed in mounting in a press as shown. 55

A feature of my improved mandrel is its eX- tremely simple construction involving the least possible number of parts all readily assembled and adjusted.

Modifications within the scope and spirit of the invention and the claims may be made it being understood that I do not wish to limit myself to the precise arrangement and formation of the parts shown and described.

I claim:

1. A tubular expansible mandrel comprising a plurality of elongated sections adapted to contact edge to edge when the tube is collapsed, a sectional exterior flange on said tube at one end thereof, an expansion device Within said tube comprising a central rotatable shaft, an inwardly tapering cone member on the shaft one in proximity to each end of the mandrel, an intermediate cone member on said shaft and rotatably mounted thereon, a group of inwardly directed fixed segments in said mandrel sections for each cone and having tapered faces corresponding to the faces of said cones and contacted thereby, said shaft threaded at one end and engaging corresponding threads in an end cone, the extreme end of said threaded part of the shaft accessible for engagement to rotate the shaft and simultaneously draw all the cones into sliding Contact with said segments and expand the mandrel uniformly throughout its entire length, said end cones provided each with a central bore opening outwardly at its larger and exterior end to provide a spindle journal.

2. A tubular, expansible mandrel comprising a plurality of elongated sections adapted to lie in contact edge to edge when the mandrel is contracted, a sectional exterior flange on said tube at one end, an expansion device within the tube comprising a central rotatable shaft, an inwardly tapering cone member on said shaft one in proximity to each end of the mandrel, an intermediate cone member on said shaft and rotatably mounted on the latter, a group of inwardly exposed, fixed segments in said mandrel sections for each said cone member and having tapered faces corresponding to the faces of said cones and contacted thereby, said center shaft threaded at one end and engaging corresponding threads in an end cone the extreme end of said threaded part accessible for engagement to rotate the shaft and draw all the cones into simultaneous sliding contact with said segments to expand the. mandrel uniformly throughout its length and a number of spaced transversely positioned sectional Wall members within the mandrel and adjustable means connecting the adjacent parts of said wall members, to retain them in proper registering positions and simultaneously limit the spreading of the mandrel sections.

EARL B. NEWELL. 

